<html>

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        .scroll {
            position: relative;
            width: 830px;
            /*展示宽度 展示4个图+3个边框=830*/
            height: 130px;
            border: 10px solid rgb(15, 15, 15);
            margin: 100px auto;
            overflow: hidden;
        }
        
        .scroll ul {
            position: absolute;
            width: 5000px;
            /*ul能存下所有li的宽*/
            height: 130px;
            top: 0;
            left: 0;
        }
        
        .scroll ul li {
            float: left;
            width: 200px;
            height: 130px;
            margin-right: 10px;
            overflow: hidden;
        }
    </style>
</head>

<body>
    <div id="scroll" class="scroll">
        <ul id="munit">
            <li><img src="./image轮播/01.jpg" alt=""></li>
            <li><img src="./image轮播/02.jpg" alt=""></li>
            <li><img src="./image轮播/03.jpg" alt=""></li>
            <li><img src="./image轮播/04.jpg" alt=""></li>
            <li><img src="./image轮播/05.jpg" alt=""></li>
        </ul>
    </div>

    <script>
        //获取元素
        var scroll = document.getElementById("scroll");
        var munit = document.getElementById("munit");
        var li = munit.children;
        // 进行滚动
        var nowLeft = 0;
        //要找到ul元素运动的折返点
        var back = -1470; //图和边框是li的宽度，展示的有4张图，所以折返点就是1260
        //定时器
        var timer = setInterval(run, 20);

        // 鼠标移上scroll停止
        scroll.onmouseover = function() {
                clearInterval(timer);
            }
            // 移开轮播
        scroll.onmouseout = function() {
            timer = setInterval(run, 20);
        }

        //运动函数
        function run() {
            nowLeft -= 2;
            //判断是否走到了折返点，走到了，则瞬间切换到0位置
            if (nowLeft <= back) {
                nowLeft = 0;
            }
            munit.style.left = nowLeft + "px";
        }
    </script>
</body>

</html>